@article{NUMA_1971__17_132086,
     author = {F. NATTERER},
     title = {Schranken f\"ur die {Norm} der {Greenschen} {Funktion} gew\"ohnlicher {Differentialoperatoren.}},
     journal = {Numerische Mathematik},
     pages = {402--408},
     year = {1971},
     volume = {17},
     zbl = {0213.16703},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__17_132086/}
}